Abstract: Two structural types of lanthanide (Ln) aquanitrato complexes incorporating 1,4-diazabicyclooctane-N,N′-dioxide (odabco) were synthesized and structurally characterized by single-crystal X-ray diffraction (SCXRD). Phase 1Ln comprises (Hodabco)3[Ln(H2O)2(NO3)4](NO3)2 (Ln3+ = Eu3+, Gd3+, (Eu/Gd)3+, Tb3+) while phase 2Ln represents (Hodabco)3[Ln(H2O)(NO3)5](NO3) (Ln3+ = Eu3+, (Eu/Gd)3+). Due to a shared cationic network composition and coordination isomerism, these Ln-based phases exhibit reversible, solvent-driven structural transitions, fully confirmed by powder XRD. Despite the presence of quenching aqua ligands, the complexes display remarkable photoluminescence with quantum yields up to 40%. The structural transitions induce a 4- fold modulation of photoluminescence quantum yields and a 2-fold variation in excited-state lifetimes. These findings establish a robust strategy for the targeted control of Ln(III) emission via simple chemical stimuli, offering strong potential for chemical sensing and luminescent device design.

Cite: Ushakov D.A. , Ryadun A.A. , Demakov P.A. , Fedin V.P.
Controllable Solid-State Transformations and Enhanced Luminescence of Labile Lanthanide(III) Aquanitrato Complexes Anchored within a Hydrogen-Bonded Organic Matrix
Inorganic Chemistry. 2026. V.65. N31. P.18334–18345. DOI: 10.1021/acs.inorgchem.6c02905 WOS Scopus

Dates:

Submitted:	Jun 5, 2026
Accepted:	Jul 17, 2026
Published online:	Jul 28, 2026
Published print:	Aug 10, 2026

Identifiers:

≡ Web of science:	WOS:001834474200001
≡ Scopus:	2-s2.0-105046778049

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